Second edition. Macao Dragon Banknotes are collectibles, and the second edition is an upgraded version of the first edition. The second edition is naturally more expensive. The collection is divided into four categories: natural history, art history, humanities history and popular science history, which are specifically divided into cultural relics, jewels, famous stones and ornamental stones, coins, stamps, documents, coupons, trademarks, badges, specimens, ceramics, jade articles, paintings and calligraphy. It should be said that collection is an art, but also a science.